x+8+x+1=7

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Solution for x+8+x+1=7 equation:


Simplifying
x + 8 + x + 1 = 7

Reorder the terms:
8 + 1 + x + x = 7

Combine like terms: 8 + 1 = 9
9 + x + x = 7

Combine like terms: x + x = 2x
9 + 2x = 7

Solving
9 + 2x = 7

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-9' to each side of the equation.
9 + -9 + 2x = 7 + -9

Combine like terms: 9 + -9 = 0
0 + 2x = 7 + -9
2x = 7 + -9

Combine like terms: 7 + -9 = -2
2x = -2

Divide each side by '2'.
x = -1

Simplifying
x = -1

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